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Financial Instruments with Off-Balance-Sheet Risk - Contractual Amounts Represent Credit Risk (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014
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Commitments to extend credit: |
Total Commitments to extend credit | $ 83,397
Future Loan Commitments [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 15,526
Home Equity Lines of Credit [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 27,708
Unused Lines of Credit [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 36,871
Undisbursed Construction Loans [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | 2,174
Financial Standby Letters of Credit [Member] |
Commitments to extend credit: |
Total Commitments to extend credit | $ 1,118

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- Definition Commitments to extend credit. + References No definition available. + Details
Name: | pnbk_CommitmentsToExtendCredit
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | pnbk_CommitmentsToExtendCreditAbstract
Namespace Prefix: | pnbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration